Well, no one responded so I shall answer my own question and provide my own data point in the hope it will be helpful to someone else.

I called the hotel the day before my stay (still within the cancellation window) and asked if they would likely upgrade me from a Jr. suite to a full suite, and they said yes (I had heard that under the terms of the FHR program, they didn't have to do that).

I started that call by saying I was unfamiliar with FHR benefits, I usually get Diamond benefits. The agent told me that FHR benefits on property were better and asked for my Honors number so that I would earn points.

I gave it to him and then the reservation immediately showed up in my account online. That was important. Before that, the reservation wasn't tied to my Honors number even though I had input my Honors number on the AMEX page when booking the reservation.

The FHR benefits at this hotel included $60 a day for breakfast for two people, which was better than the $30 a day Diamond benefit.

It appears that I got full Honors points on my incidental spend AND on the prepaid spend I put on my AMEX platinum. This was a pleasant surprise.

Again, make sure that you call property ahead of time and give them your Honors number or give it at check in to increase your chances of getting points, don't rely on just inputting it on the AMEX booking page.