Note to the mods: As I just have been permabanned from r/BDSMAdvice for asking this there (for including the link to a video), I hope that this is allowed here. If not, please just remove the post and do not ban me, as I would love to still participate in a community even after making an error. I asked the mods of r/BDSM, and they guided me here. If this is not suitable, please guide me to a community where I can ask this question.

My idea

I want to mummify my sub's limbs and make them walk on all fours, effectively their knees and elbows.

The inspiration came from this video: https://bdsmvilla.com/video/44240/twat-hang (around 12:10 and onwards)

In that video, they seem to use a soft mattress to have the subjects crawl on. I don't have that in my apartment - most of the flooring is wooden, there is one carpet.

Since the plan is to put my sub into this position for a prolonged time (optimally 1 hour , depending on feedback), I have some concerns:

• Blood flow and cramping: is this viable at all? I don't want to cause any damage. The scene will start with my sub gagged after an initial comfort check, and I will then check on them again regularly. What would be a good timeframe to check in on them?
• Joint safety: since my flooring is harder, I thought about including cushions within the limb wraps to cover knees and elbows. How do I choose a good material for this? I could cut up a thin (~1cm) & cheap yoga mat made from PU foam.
• Wrapping material: I currently don't have the medical (?) wraps at hand that I've seen in the video linked above as well as other mummification content. I've seen people do mummification with plastic wrap. Do I need to pay attention to any differences between the materials, and is it safe to use here when there's movement involved?

Thank you all for the inspiration :)