I am looking for a recommendation for subject device.
I ordered a Cable Matters 202024 device and found out I couldn't boot my RPi3.
I called several manafactures but they couldn't confirm I would be able to boot my RPi3.
Just an update - I've not found this to be a reliable method of booting in my case. I've tried powering them on simultaneously, powering on the external powered HDD first, and vice-versa. Usually it does not boot. Once in awhile it does on second or third try.