My wife and I have been poly for going on a decade now and my girlfriend has been part of the equation since damn near the beginning.
My wife, girlfriend & I all jointly own our home together and things have been great!
I (male, cis-het) don't date outside the two of them (I don't have that kind of time!) ... both of the ladies have other partners though, mostly with the goal of them being long term, but like most relationships (poly or mono) they generally fizzle out for one reason or another. Wife has a partner that's been pretty stable for almost a year though and girlfriend has a LDR that's been strong for 5ish years.
We've all "come out" to our family and friends long ago, mostly with no blowback. I am not close with people at my current job, so they don't know, but, I also use the words 'wife' and 'girlfriend' so if they haven't picked up on it, it's not because I'm omitting, I'm just not telling people that don't need to know about my personal life the specifics about my personal life.
If you were to judge monogamy by the shit that pops up in relationship advice threads, people would have a bad impression of it as well!