I use those magentic locks, and have for quite some time love them.
As for the piano hinge id advise against it not that it wouldn’t work or that i have also used it in the past, its just more that its a pain in the ass with loading and you cant adjust it once set and light sealing is harder with them, vs say actual door hinge hardware where you can off set the door gap a little to account for say whatever foam striping your using for light sealing.