If by "open cabinet", you mean no back or front, then yes, I think you'd be fine with the simple multifan unit.
I use my Multifan unit with a Denon 4520 which has a USB port on the back. Many of the newer models no longer have that, and I don't think it looks very good to have it plugged into the front USB.
This one uses a standard AC plug:
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If you want it to turn on-off automatically, I would use something like this which switches outlets on-off depending on the on-off status of the device plugged into the master outlet:
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If convenient, use the TV as the master controller for on-off, but AVR will work fine as well!