Partnered ENM guys -- how can I find you?

We hear a lot on this sub about how difficult it is for ENM who are already partnered to meet women. Let's say I am a thirty-something, mentally stable, moderately attractive woman in a mid-sized city hoping to find a partnered FWB or boyfriend-- where are you guys actually hoping to meet women like me?

What apps are you using? What social events are you going to? What other strategies are you trying that maybe I haven't thought of?

I would prefer to meet a partnered guy because I already have a boyfriend and like dating people who are in similar situations. My ideal dude is 27-45ish, cohabitating, engaged, or married, gainfully employed, hygienic, and with a functional level of physical fitness. (Dad Bods can be hot!) I know he's out there somewhere... but where?