Quick reply, no to putting both on the same circuit. My humble suggestion, a dedicated circuit for each. I have used Lenhart's, ECI, and R&A for various reasons, and would recommend in that order.
Also, you may want to reconsider having these in the garage, especially during the summer. Please do a little more investigating before you do this. If you have a west facing garage, it will be getting very hot in the summer time which is going to be very hard for these appliances to work well. If the garage is not vented, you are just going add even more heat to it.
Hope this helps, and good luck with your project.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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