I have an unneutered male (Rowdy) and he does mark in the house - but it is just a few drops here and there and he doesn't do it all the time - it comes and goes
I have wood and concrete floors (for the most part) and so it isn't too big an issue. I don't use a belly band because we have a doggy door and he goes in and out into the backyard all the time - I want him to be able to PEE outside.
Rexy is neutered (at 6 months) and squats to pee and only pees once outside - as opposed to Rowdy who may pee 5 times on an outing.
We hope to breed Rowdy at least once or twice, but haven't found a female yet. Marking is an issue, but not too big a one for us.