I've found out the hard way that most of the wall bracket's for a DS-2CD2132-I dome are for 2.8mm lens. I have 4mm. The base is too big for the bracket plate. Weird.
I'm batting zero on trying to find a source for a wall bracket for the 4mm dome. ANyone have a source or one laying around they want to get rid of? AliExpress might work but they are shutting down for Chinese New Year the rest of the month.