The issue with males marking tends not to arise in the owner's home if the dog is housetrained diligently, but often does for intact dogs when the dog goes to visit someone else's home. I have never yet had an entire male rescue dog, whether from good home or bad situation, who *didn't* raise his leg in the house (or at least try!) a few times. The majority of neutered males in my experience with rescues and friends' dogs don't tend to do this as visitors.
Marking is not just a male trait though; females also can mark especially when unspayed.
My males once past housetraining have never marked indoors at other people's houses. Both are neutered.
At bottom (pun intended) the issue is really a training issue and a management issue when visiting -- making sure you both are good guests!
Personally I absolutely love the boys.