Screw the rest.
I think that Pyle piece with the separate pre-amp/rca output section is completely genius. It's ideal for what you are striving for and provides a nice way to get audio from the garage to a head-end location while giving you basic control of your Bluetooth or a local audio device.
The speakers are generic and I would go to at least an 8" model, preferably 3-way, but in the same price category. This will give you more bass response and will be nice for listening in that zone.
The amplifiers... Yes, and yes.
The cheap one is wimpy, the good one is overkill.
Check eBay for 12-channel power amplifiers. You can pick up a complete amp which can independently power all your zones for under $200 fairly easily. Check for major brands like Niles, Sonance, or Speakercraft. Ask about others.
ie:
https://www.ebay.com/itm/Niles-SI-1230-12-Channel-Power-Amplifier/162911217004?epid=73215323&hash=item25ee43e56c:g:E-0AAOSwUg9ajIeS
If it is listed as 'used' then eBay will protect you. Used product MUST work regardless of someone saying 'as-is'. I've had good luck with eBay this way, but I tend to spend a bit more (up to about $400).
Make sure to run 14/4 cabling and give your head-end location enough room for proper cable management.
Also consider running more wiring if you feel you may want to upgrade and add other locations, like your bathroom, dining room, kitchen, etc. I put about 20+ zones in my home. It's a great thing to do, especially if you are building an new home.