I am playing MM1 successfully in a DOSBox on W7 (not full screen)
Each time I restart the game the DOSBox steps slightly down and across the screen
(as though it were a window in an MDI application)
It's not a showstopper in any sense but I wondered if there was a way to always force the DOSBox to open in the same screen position (eg top left)

All the best

You could lock the window's position with a program such as WinSize2. That way it would snap back to the chosen coordinates every time.

Alternately you could increase the scaler/resolution/etc. in DOSBox so the window is too big to move by itself.