Welcome to YT!!! My recommendations are belly band to protect your stuff, combined with lots of training and vigilance. When your pup has free roam of your home, keep a watchful eye. When you see him lift his leg to mark, use a distracting noise to get his attention and follow it with a firm "no," not yelling, just a firm no. When I was training my pup, I used a clap as that always got his attention, said "no" and direct him into something else. I also would encourage marking outside, mostly because I wanted him to distinguish that inside is a pee free zone. I hope this helps!
__________________ Littlest JakJak 
We miss you Kaji 
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