Have you looked at this Gazelle
The Gazelle Ultimate C380 HMB electric bicycle skillfully combines a sporty urban bike and a comfortable touring bike into one versatile and delightful package.
Between beltdrive and fork with enclosed shock it is as maintenance free as it gets. Excellent brakes which nice to have even if your commute is mainly flat. Nuvinci drive means you can find perfect cadence to maintain 20mph. I find with 11spd 3rd is to low and 2th to high, so end up cruising at 18-19mph, not big deal for my 5mile commute.
With performance line motor you should be able maintain 20mph into most headwinds and moderate climbs. There is option to switch Sports mode to eMTB which varies power between Tour and Turbo, something shop has to setup.
As commuter in hurry who wants to avoid showers at work you will most likely default to Turbo regardless of motor.
With belt drive running costs are really just new rear tire every 1500miles or so. With derailleur expect new chain ever 2000miles, cassette every 2-3chains, plus chainring, jog wheels and lube. There is also hours a year of your time maintaining drive train.
The other lower cost option is 8spd IGH with chain, single spd chains and spockets last forever and very cheap to replace. If you don't clean it and miss a few lubes it doesn't matter.
NB I've no experience of belt drives but spending hours a year maintaining a couple derailluer commuters.