I have an L-shape butcher block setup between two filing cabinets. It's hard to skip the inner legs completely without extensive metal bracing but the supports

I have an L-shape butcher block setup between two filing cabinets. It's hard to skip the inner legs completely without extensive metal bracing but the supports you need are technically minimal if you do minimal strapping. I integrated a swivel foot rest that sits 45degrees to the corner. It's about 36" wide and the posts going up from the swivel points support the back end of the L.