Check with the Cg you are going to stay at.
Albeit the attached screen room is usually not questioned the EZ up type tents that are separate from the RV are not allowed in many CG's.
IMHO RV screen rooms are expensive and a pain to set up and pain to take down. Ask around to fellow campers before making that purchase.
Also keep in mind weather emergencies. Sometimes you have minutes to get that awning in to prevent damage.......now add the time to get that screen room down before you can bring your awning down. That is the main reason I decided not to add a screen room. Just saying.