That's all pretty much clear.To get a tax certificate tou need to spend 183 days in Dubai, there is no way around it. At least a personal tax certificate. For the company tax certificate, I'm not an expert, but if you live in dubai 10 days a year, it's hard to say that the company is managed in Dubai, you need local presence somehow. But I'm not an expert in this.Fred know much more about this for sure
So, you know that Dubai consider you a resident even if you spend two weeks each year in the country. This means that the banks ( which you can open just with your emirates ID ) and brokerage account ( which will require a proof of residence, so an EJEARI, which is a long term contract ) linked to your UAE residency will not report you to any country, there would be no CRS messages even if you are not Tax resident in the UAE.
Residency and Tax Residency are two separate things, the first is the ability to reside iin a country for the whole year and use the infrastructure, the second is the fact that you have to pay taxes in that country. In the UAE and in most countries, to be tax resident, you need to spend at least 183 days in the country ( in the UK is different, after 60 days you are tax resident, for example ). If you spend 183 days in the UAE you receive a tax certificate and that certificate means that you have "paid your taxes" in the UAE and thus, if the UAE and another country where you might be liable to pay taxes, like your country, have a double taxation agreement, your home country can' t claim taxes on you even if Dubai taxes are 0 ( this is not entirely true, in many european countries, if your wife lives in the country, you are considered tax resident in your country even with a tax certificate from dubai, as Dubai is black listed for personal income and you will be fined when you return your residency to your home country ).
So this is about the tax residency part. The truth is that most of the people who live as digital nomads don't spend 6 months in any country, as you've see the breakdown above, thus they are not tax resident anywhere: they work remotely for USA companies and live around the world. In this case the law states that there is a country which is where you should pay taxes, normally your home country, but of course your home country knows nothing about you, because they have no idea how much money you are making and where you are making it, and of course they can't check everybody, so you can live a digital nomad lifestyle quite safely. The problem arise in two cases: you want to buy a property somewhere or you want to return to be resident in your home country: in both cases, especially in the first, but in the second too, you will be asked "where do the funds you are using come from?" ( which means, where have you paid taxes on that money ) and, unless you hav inherited them, you will have no answer as you don't have any tax certificate. So problems start here, and that's why I was saying that at some point I will need 2-3 years of tax certificates, because that proves that you paid your taxes in Dubai, and have "cleaned" enough money to buy the house in France.
Hope this clarifies things a bit, they are even more complex than this, based on your country of origin, as different countries have different rules on what happens when you relocate to a black listed region like dubai. In general, if you have wife and kids, they need to move with you. The more things you have, like houses, cars, comanies, the more complex the move will be: in these more complex cases please do ask advice to agents and specialized agencies that knows how to do things right.
I was wondering why you care about CRS. It should be irrelevant in your case.