For me, I have an electric standing desk from IKEA, and a FlowFitness walking pad. Very pleased with that, since I can fold it and roll it out of the way with the wheels, once I want to sit down.
I use the Lifespan TR1200. I also have a cheaper Titan Fitness one, and at least with the case of the two of those you definitely get what you pay for. The Lifespan is much quieter and wider.
That said there might be better stuff on the market now as I purchased a while ago.
https://www.flowfitness.com/treadmills/dtm100i/