I’ve not heard the Zu’s but there is a review floating around that compares a Zu standmount to an Omega standmount with high praise for the Omegas.
One thing I liked about the Omega floostanders is they are very shallow and are able to go as close as 6" to a rear wall. A lot of horn designs require acres of space behind them. Especially Decware horns which are all rear firing.
I have a writeup on them on another thread here: Naim/PMC to Luxman Neo Classico II/Omega