We had 2 break ins nearby so I've got some good justification for putting them up. Then I'll just let her know they are there for security and mention nothing of the other man.
This is why I recommend putting them up. You wanted to put them up for security, before you even knew your W was having an A. nothing changes, put them up for security and that's that.
I have a little remote control vehicle that I can drive around my house when I'm not home, it's got a wifi remote and wifi camera that streams to the internet (and also local storage)... it freaks my cats out.
But this is just "normal behavior" for me to have weird crap like this going on at home. My W wouldn't bring OM inside cuz she has no clue what I have going on in that house HAHA.