Amphibious salamanders in the dry hot sands of Elseweyr.... not going to have an optimal outcome I think.
I have a "pet" salamander who lives at my house. When I see him scurrying along, the last thing I think is it would make a good mount, as they wiggle so much when they run. ZOS even does this with the Salamander Mobs we have now in the game.
Anyway, something would have to be done about how the player character would get shaken up