I've tried a couple of versions of this:
1. the picture of the barrels hung vertically - all the weight's at the bottom, so you need to be *really* beefy and strong to get it to spin - I could never get mine to work well, and dumping it was an all or nothing event.
2. I tried the "just roll the barrel on the ground" system and I recommend you install some veins like dryers to stop the stuff from just slipping around the circle instead of actually "tumbling". I still didn't have
enough strength to roll it effectively.
3. I do like the concept of the wire one in the top picture - I think it's worth going to the effort of building it a stand and
not under engineering it - wet compost is heavy! You may have liquid trying to drain out and it may be stinky, so consider having mulch under it and a bin of mulch to keep sprinkling over every few days if there's any smell or find a way to capture that liquid "fertilizer" and
water it down and
feed it to plants. (10 to 1 is the usual ratio I read about)