My current Rears flail is not offset but my prior one had 2 masts — it could be connected to the 3-point at two different locations. I found that very handy. Rears equipment is very well made, and my earlier research 7-8 years ago indicated it was the easiest to maintain including knife replacement (perhaps overlooked benefit). The only downside to my current 5-year old Rears is it does not work with my iMatch. Don’t know if that’s changed.
Edit: my dual mast Rears SPF only offset by 12 inches. That was enough to meet my needs but maybe not for the OP and others. The Land Pride model is cool but requires 75 hp minimum.