I have twin esc's in some of my scale ships but i did keep both switches for the esc's as im not sure if you can use 1 switch to turn both on
mounted side by side its easy enough to switch both on
Im using 2 spektrum DX8's on mode 3 with the mixer enabled for elevons gives me both throttles on left stick with 1 esc in elevator and other esc in aileron channels it gives me full ahead with stick forward and if i put stick left it gives me full astern left engine and full ahead right engine and vice versa 🍻