I brew in my basement stairwell and there's box window that conveniently overhangs part of it. So I put a lag bolt into a floor joist.
You can almost see it in this pic...haha
That's the grainbill for a 10 gallon batch about to get sparged. The kettle on the right is my HLT. I drop a silicon hose into the top of the bag and pump water over the grain bed to sparge. So my BIAB is more of a batch sparge system using a bag/kettle as MT. I mainly started doing this because I like BIAB and didn't want to upsize my BK for 10 gal batches.