Rhe gap is about 4 inches wide and I'd like to cover 10 inches deep. Not in the picture is an under-sink cabinet I got but because of the weird shaped and sized underneath of the sink I couldn't get something to go up high enough to also help this problem.
As mentioned it's an apartment so preferably nothing that needs to be installed into the wall.
Also would appreciate any recommendations on some sort of grip I can put on the surface of rhe sink to keep things from falling #home source