Strong magnetic feeding dish

[iMemphis118]

Hi all, I just created my vivarium, and used this black foam to do the background in my Exo-tera vivarium. Based on the image here, are there are magnets strong enough to hold a dish through about 3/4" of foam? I wanted to put the feeding dish towards the back, left wall. Essentially, I am looking for a very strong magnet with a feeding dish, and wanted to know if someone had a recommendation on a very strong one.

Thanks