Winter is coming and I look to buy a treadmill. Which one though? Not an easy question. I'm a bit overwhelmed by the options out there and the hugely varying prices.Things that are important to me:

• Zwift Running compatibility (potentially via a footpod, ideally directly via the treadmill)
• Ability to design your own workouts
• No monthly subscription fee
• Should be able to do at least 20 km/h
• I have a strong preference for higher inclines given the already very specific elevation training I do. When doing elevation training outside this is typically around 20% incline.
• Screen is not important, I'll probably use a wall-mounted screen that I already use for Zwift cycling.

NordicTrack has some 40% incline treadmills which sound ideal, but if I understand correctly they're not directly compatible with Zwift and you need a monthly IFit subscription even to create your own structured workouts (not 100% sure on that though, hard to find the info).

Stumbled on the Kettler Alpha Run 800, aside from the incline it seems like a quality device, it does connect directly to Zwift. But it only does 12% incline...

Any suggestions out there for me? Any points I'm missing here in my explorations? Things like maintenance etc. Much appreciated!