When buying Wilson speakers, either new or certified preowned from an authorized dealer, they will come to your home and set them up. During that setup, the dealer would/should recommend any room or system improvements which would enhance the speaker's integration. I went that route when I acquired my Alexia's and could not be happier.
Wilson’s Alexx V vs Alexandria XLF
I have a very large room with high ceilings etc, would it be reasonable to move from and Alexx V to an XLF to fill that space or would that be a down grade?