Where did you find this pic? Cause googling "topside creeper" gave me an Amazon link to this exact product with this exact pic as it's first image.
https://www.amazon.com/Traxion-3-100-Foldable-Topside-Creeper/dp/B00QGXSODA
Thanks for letting me know this is a thing, I've wanted something like this for a while. Even at 6'2" it doesn't feel too nice having battery terminals or whathaveyou ground into my gut.
This is the one I used but I welded the upper corners so I wouldn’t get cut. https://www.amazon.com/Traxion-3-100-Foldable-Topside-Creeper/dp/B00QGXSODA/ref=mp_s_a_1_1_sspa?crid=JF890UOA39S4&keywords=top+side+creepers&qid=1643301583&sprefix=top+side+creep%2Caps%2C130&sr=8-1-spons&psc=1&spLa=ZW5jcnlw...
A topside creeper is your answer.
Here in the states, trucks are so common that every dealership or shop I've been in has at least one of these:
https://www.amazon.com/Traxion-3-100-Foldable-Topside-Creeper/dp/B00QGXSODA
The local ford dealer has one per tech.
Something like this https://www.amazon.com/dp/B00QGXSODA/
> they don't have chairs to sit in while lending into an engine compartment?
Uh...
https://smile.amazon.com/Traxion-3-100-Foldable-Topside-Creeper/dp/B00QGXSODA
> workers cant sit while putting shingles on a roof.
Boy, this is getting embarrassing for you.
https://www.roofingsuperstore.co.uk/product/sit-n-slate-roofers-seat.html
> mobility scooters for the mail carriers
You really aren't helping yourself much, best to stop being so ignorant.
https://www.trucks.com/2019/09/03/postal-service-delays-new-mail-truck-contract/
https://www.sfgate.com/bayarea/article/Dashing-new-device-for-delivering-mail-Postal-2795396.php
Ya know they make a tool for this -> Topside Creeper - Might save you a bit of pain in the umm, waist area =)
Or you could get something designed for the job, even if it will give you nasty chest pain
https://www.amazon.com/Traxion-3-100-FFP-Foldable-Topside-Creeper/dp/B00QGXSODA All ready on the market.