Do you need to rent an apartment there or they don't care if you stay there or not?
Here's the new Paraguayan tax reform
If you do the immigration process by yourself, then you need to rent an apartment. If you use a good consultant they'll arrange for an address (don't ask me how) which can be used for official purposes, and for which the government will issue a Life & Residence Certificate which is the best proof of address in the country, though you can't use it for mail or anything (you can rent a PO Box for that)