Ruckus ... R500 I think (can't check atm) from ebay.
MIMO, multiple SSIDs, etc, so work really well with the load of 2.4Ghz wifi home automation gadgets I have around the house, with 2 of us working from home on Zoom / Teams calls.
Reflash them with the "unleashed" firmware and you don't need their controller.
I have basically the same setup, but with Radicale.
Radicale is really lightweight, but quite basic - which is fine for my needs.
Out of curiosity, what pulled you to use Baikal?