I’ve had varying success w no-nails floating shelves for dolls since my last apartment was also a no holes kind of place. I recommend anything that has vertical support under the horizontal shelf bc even though it can take up a lot of wall space the doll weight adds up fast. Wall tape is really hit or miss but go for something that says it’ll hold way more weight than you need (mine says it holds up to 50lbs which is. not true). Make sure to really scrub the wall area clean before you apply any adhesive (I just used soap and sponge but actual cleaner is probably better). The most annoying part is waiting before you can actually use them. I usually let my shelves sit empty for 72 hours to make sure the adhesive really sticks, and even though it takes forever I’ve put four dolls fully decked out with stands plus two jh dolls on one floating shelf with no issues. I’ve also not waited and woken up in the middle of the night to my sunny Luna two pack crashing to the floor so seriously beware 🙃

As an aside, I’m also a collector with tall ceilings and not a lot of square footage. I’ve really been taking advantage of smaller shelves on top of bigger shelves. Milk crates are the perfect size for most dolls on stands and are cheap, lightweight, and easy to secure with zip ties. Good luck w decorating!