Too many thoughts....
If marking is the problem, neutering the male should take care of this. You don't mention if you would be planning to breed them. But if so....
Would you be taking these two mainly because they are a easy way to breed? Consider whether they are really suited for breeding. Also consider whether you are adequately prepared for breeding and the resulting litter. This is a LOT more work (and sometimes heartache) than most realize.
I don't know you and your situation, so am not saying this to be rude or discouraging. I have just seen a lot of people think they will "make back" the cost of their dogs by breeding....and are not prepared at all for what that means.