you mean a hang-on siphon box or you wanna drill and use an internal box? 10g is a bit thin to drill, and also bit small for most of the siphon boxes i've seen.
what do you want the sump space for? fuge/skimmer? i'd probably think about finding/making a small acrylic 'sump' (that you can drill and put a bulkhead in) that sits above the tank and drains down to the tank. though if you do want to drill the tank, we could just glue a piece of glass to the back to reinforce it enough to take a bulkhead. it's not the drilling, but the weight of the plumbing that cracks thin glass.