Thanks for the tips.
I already put them on speaker stands, however, and indeed I would like to build them like the RF-5, the speakers miss some high and mid.
I tried several things, and no matter how I trie, the low is not extremely low, the mid sounds weaker and the high also sounds less strong.
i know they are centres and for that purpose they are really good. Bright voices, good positioned.
So yes indeed I'm looking for a new crossover module and cabinet layout.