Puppy, litter boxes and an apartment… HELP?

Im moving into an apartment next month, and there are NO green spaces, its an urban area, so there are no parks close by. I just got a maltese, and he is trained to do this business outside, in a cement area we have in our current house. But my new place does not allow dogs wandering around. The apartment has patios, but they are both ceramic tiles. And to make matters worst, it pours for 4 months straight where i live. (Its like living in a rain forest). So, i was about too give my pup to my mom, cuz she has a large back yard, but she has 2 HUGE dogs, so im kinda worried plus i dont wanna give him away . So im wondering if anyone has had experiences with litter boxes for dogs, i have googled some, but not completely sure about em, or if someone has any ideas THEY WOULD BE APPRECIATED!! thnx! and sorry if its looong!!
btw, i used pee pee pads. they smell HORRIBLE, plus, he eats them!

i would leave with your mom because im pretty sure it wont like stayin in one place it might be bored and stuff