No flat earth model, that claims to demonstrate the relationship between the sun and the Earth, has ever shown how the sun can appear to be rising from beneath the horizon in the morning, then setting below the horizon in the evening - from any vantage point on the Earth.
Did you look at the tfes.org models before you posted a complaint on the tfes.org website? - https://wiki.tfes.org/Sunrise_and_Sunset
I haven't been through every last link--but I don't think electromagnetic acceleration is a thing and if you don't know the height of the sun, I don't think you can use the "perspective" suggestion for how it sets.
My understanding, having been around the community for a few years now (mostly lurking) is that "Electromagnetic Acceleration" is vital for a flat earth model. As such, several loooong threads have sprung up about it over the years.
The challenge from the flat earthers is that they have claimed a formula describes this phenomenon, but it requires a "Bishop's Constant," which is not yet discovered. (Meaning, they don't actually have a formula). But because this is so necessary, threads debating EA usually just get locked after a while.
My suggestion: read over the wiki carefully regarding EA, as that is THE FLAT EARTH ANSWER to your original post. And then if you think EA doesn't work, explain why.