Ondrives crossed axis helical gearboxes offer an excellent solution where a 90 degree drive is required.

Crossed Helical Rotation Direction.
Using different helix direction changes direction of rotation compared to input compared to the other helix direction.

Helix Direction RH-Right Hand - When input rotation is clockwise , output is pulled towards input. When input is counter-clockwise , output is pushed away from input.
Helix Direction LH-Left Hand    - When input rotation is clockwise , output is pushed away from input. When input is counter-clockwise , output is pulled towards input.

Testing in your applications is necessary. You will need to assess duty cycles and confirm gearbox suitability with your own calculations. All figures listed are for guidance only.