shower base pan

Hi everyone, Our plumber installed the acrylic shower base without a mortar bed and I noticed it moves up and down when pushing on the back corner (1st video) . Asked them to fix it but they pushed ahead with putting hardieboard on the walls and floors. They added some spray foam on the back...

Hello, I am looking to replace my tub with a standing shower. I have a couple of questions. Can I replace the 30" wide tub with a 32" wide shower pan, or will this cause issues with the drain lining up? How complicated might the drain be to move? Also, is there a problem with having the drain...

or.... should i get a plumber? Thank you Terry Love for the info a week ago about how you would have to change the plumbing underneath to match the new hole...that makes sense...... i learn something everyday....im 25 and not the best construction guy but i can figure a decent amount out...