Micro switch/relay

Looking for a z-wave micro switch/relay that I can use in-wall to control 2 different existing wall switches. The problem is the two I want to add z-wave capability is in a 4 gang electrical box with a bunch of existing wiring so size matters. I have a 2Gig Gen 2 panel.

Thanks in advance.

The only in-wall devices which use your existing switches and would be installed in the gang box that I am aware of are the Aeotec Switches here.

They have been updated since I last used them, but they are small enough that with some effort will fit multiple to a gang box.