Jury rigging a WiFi controlled speaker selector


My home stereo set up is an NAD c 375bee (150w) and I run three pairs of speakers (hardwired throughout the condo).

My ADCOM GFS-3 speaker selector is cutting out on the left channel intermittently (unusual no?) Anyway, as I seek to replace it, I'm wondering how hard it would be to create a WiFi controlled (or even IR controlled) speaker selector using a product like this (thanks to user @imhififan for recommending it on a different thread.)
https://www.amazon.com/MHCOZY-Channel-Control-Appliance-Compatible/dp/B07MXCWRGX?ref_=ast_bbp_dp&th=1&psc=1

Actually, that switch is meant for power appliances so I need to find the equivalent specs for speakers don't I? But assuming I can find that, would it be ill advised to use just ONE switch for each PAIR of speakers by running only the + or - from each pair through it? I just need to off/on the circuit right? 

If I situate the WiFi switch behind the ADCOM GFS-3 and before each speaker pair then it seems like I could get double duty out of a single switch, or am I missing something? Besides slight cost saving it's the clutter of six switches and the fact that I don't want to have to switchon/off each left and right speaker separately that appeals.

For context: Only one company makes an integrated IR remote speaker selector, the OSD ATM-7 which only handles 100wps and costs a fortune.

Thanks for your insights and suggestions!


pilastr
Oh! Thank you for this. Is it is as simple as connecting wires? Am I crazy to think I could assemble this myself using only those two parts and some speaker wire? I have no previous Arduino experience (though I have assembled and configured PCs and WiFi networks.)

Is it is as simple as connecting wires? Am I crazy to think I could assemble this myself using only those two parts and some speaker wire? I have no previous Arduino experience
No Arduino programming required, soldering experience would be nice and you do need a enclosure, 5v power supply, 20 pcs of speaker binding post and some connecting wires to complete the project:

https://www.amazon.com/dp/B075WZRW75/ref=sspa_dk_detail_1?spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyOTI0U1ZXR...

https://www.amazon.com/BOLWEO-100-240V-Wireless-Connector-5-5mmx2-1mm/dp/B0719GY29M/ref=sr_1_4?keywo...

https://www.ebay.com/itm/10pcs-Gold-Plated-Audio-Speaker-Binding-Post-Amplifier-Terminal-For-4mm-Plu...
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@noromance That unit looks easier, but it says 8 channel. is that enough for three speaker pairs? I need to solicit help from a soldering-capable friend and read up on relays. Thanks for the suggestions all! 

One thing confuses me,  Is sound not degraded running through these selector units? Those connectors all look way too small to handle 14 gauge. I currently use tinned braided monster cable. I'm probably missing something again? Thanks for suffering the newbie questions!