Every Gloriads blog article tagged Placements.

Reserve share of voice buys the top of Amazon search for your branded keywords at a fixed upfront price: 5 to 1,000 keywords, $3,000 minimum, no auction.

Yes: by default, Sponsored Products ads also run on other sites, apps and creator content in 19 countries, on the same bid and budget. How to turn it off.

Amazon Sponsored Display ads appear on Amazon product and search pages, Amazon Fresh, Whole Foods, IMDb, Twitch and other sites and apps, by targeting.

Amazon's bidding strategies: down only lowers your bid when a sale is unlikely, up and down can also raise it up to 100%, fixed keeps it. Which to choose.
Gloriads runs your Amazon Ads by rules you control, on all four ad types.