It may be too industrial for what you want, but I'm loving my 30x30 stainless steel equipment stand with undershelf and 2" edging (from Webstaurant
). They also sell longer legs, to make it counter height, and we bought an extra undershelf. You can get a longer length to accommodate your extra grinder. It's very stable and secure and the edging really comes in handy.
Here's my sick setup: