I lived in murano this year. Honestly blue tack should be fine as my friends who used it had no problems. I personally used glue dots. The one thing is during flat inspections you will need to take them down but it’s not too much hastle. Staff generally are quite tolerant with general wear and tear because Murano isn’t exactly the Ritz. Do try to keep ur kitchen clean and don’t make any holes in the walls or try to replaster it yourself (idk why this happened more than once) and you should be left alone. There also isn’t a deposit you just get a charge put on your uni account for damage.