I am sure doing that would negate the warrantee on the conveyor. When I did some store conversions here a while back, we put in a Blodgett GS3240 for pizzas and used the old lincoln Impinger 2s they had for side menus. The Impinger 2s are smaller and fit right on top of the Blodgett with only about 4 inches of the cooking chamber hanging over. Just make sure that the side with the brains is not getting any heat directly from the oven.
At one shop, we had a gas company set up the 2 ovens so the controlls on the top oven were right over the bottom oven entrance, and the circut board on the Lincoln burned out in 3 days.
They fabricated a heat shield for the other shops after that, but within a year 8 of 15 shops had the upper oven go out on them, and none of them were covered by warranty because they had been set up “incorrectly” according to the manufacturer.