

Your asrock option should be good, you are concerned about power draw but the manual asks for 90w adaptor with 2 HDDs.
The Odroid has a more specific ask
– DC 19V/7A power adapter is recommended if you use more than one 3.5” SATA HDDs together
Your 90w may be underpowered in either case hard to tell.
VERY IMPORTANT PAY ATTENTION TO THIS SENTENCE OP