Some interesting comments on tubeless, I commute daily (Or at least I did until recently) and ride mtb all year round.
I run 4 mtbs, all until the beginning of last year with tubes. I’ve had more than my fair share of punctures with tubes, once 3/4 through the Wiggle Up and Down mtb, where changing the tube nearly had me throwing the wheel down the hill, esp pumping up a large volume tyre with a mini HV pump, which isn’t funny when you’re feked.
Decided after a ride in the surrey hills, where I got three punctures, ran out of spare tubes, couldn’t get the patch to take and had an hours walk back to the car that tubeless was the way forward. Haven’t looked back since.
You can use non tubeless tyres and rims, if you’re patient and seat the tyre overnight with a tube first. If you’ve got tubeless ready rims and tyres then I’d advocate tubeless every time. Can’t imagine any eBike now being supplied without tubeless ready rims.
Been running my Scott FS with tubeless since I got it last year, no issues and surprisingly no loss of air in between rides. I’ve also got my Cannondale, el Guapo And Cotic bFe, wife’s Cube eBike all tubeless with no issues, either getting them setup and riding them.
Sealant - I always use Stans no tubes, works for me every time.
Valves - I’ve used muc off valves (handy as they have the valve core removal tool built in) and Schwalbe and Stans. The muc off were the best of the 3.
Rim tape - either gorilla tape, or I got some of this on advice on STW which has been pretty good
https://www.ebay.co.uk/itm/162354590164 and if you order the right width no need to cut it down.
And lastly unless you’ve got a compressor get yourself a tubeless track pump, makes the whole exercise a doddle. I’ve got this from chain Reaction Cycles
https://www.chainreactioncycles.com/lifeline-airblast-tubeless-tyre-track-pump/rp-prod155451
Running tubeless means you can run tyre pressures really low, down to 19 psi, probably lower.
I’ll never go back to tubes, utter bloody pain in the arse.