Possible problem!

[Max@ableskills]

Hi and welcome. Think you are really going to struggle with this i am afraid. If ready mixed adhesive was used you may have a very slight chance depending how the tiles were originally fixed. If powdered adhesive was used then no chance i am afraid. Good luck

 

[steveb]

welcome

 

[Alberta Stone]

Welcome.
I have run into this before but the ones I removed were bonded with silicone.
I got an old 8 inch scraper blade and put a fresh edge on one end which made me a tool like a long chisel and then I carefully worked the blade behind the tiles with a small hammer. It worked very well, but took some effort.
Had no damage at the end.