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you can get side by side plates made to any width, obviously, flexture becomes more apparent the wider you go.. My side by side setup is adjustable, when using a 90 or 102mm refractor with the 80mm guide scope, I put them as close together as possible, when using the 80mm guide scope with the C11, I space them further apart for 2 reasons. 1 - So they will fit. 2 - its easier to balance..
Its your choice if you want to go up on top of the imaging scope, or beside it.. I chose beside it as for me it was cheaper than buying a dovetail to mount above the rings for each of my refractors, plus a specialized bar for above the C11 tube to fit the guide scope.
Also because adding more weight on top of the C11 would introduce flexture problems of a different nature, as well as moving the center of gravity further away from the RA axis...
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