Can I power multiple devices on AUX?

My board and add-on board are powering a siren and a Fire HD tablet. I'd like to add a 2nd tablet and would like to know if I could just power it by wiring it to the same AUX that my existing tablet is wired to. Or, do I need get a separate 12 V power adapter for the 2nd tablet?

One clarification, one of my AUX outputs is powering a motion sensor in addition to a siren.

I ended up going a different direction. I've changed my mind on using the konnected boards' AUX outputs since I don't need the tablets to be on battery backed power. Instead, I found this multi-channel DC adapter and will use that instead to power the tablets.