Just the kitchen, not the other room? Then I’d put one on each end wall, where you have the line and the wall facing that. I’d think mounting them closer to the windows, away from the counter might sound best. You’d get them lower there than centered where you’d have to go above the lights.

I’d angle them down slightly, pointed in as much as possible. Then fool with the exact angles once they are up and you can check the sound.

I’d run them as two Rooms, grouped so you got the most even sound as you aren’t going to be always in the stereo sweet spot.

I agree and definetly not aiming for the stereo sweet spot just because there is too many positions where you are liking standing, seating etc.

I was trying to cover the entire area with music not just the kitchen area, ideally.

Idea 2: Latest whacky thought is what if I placed just a single five on the red line entered in horizontal (to make it behave as stereo).  Would a single provide a rich warm quality blanket or am I asking too much?

Idea 3: do idea 2 plus place the second five on the total opposite side above the patio door, entered and horizontal (this may mean running the power from outside although solid steel so not sure how I'd even do that)

You didn’t give measurements but I’d think from the pictures you are going to need at least three Fives to get fairly even sound in there, maybe four.

the whole space is about 9-10m long and just under 5m wide

I’d look at three then, spaced along that back wall. Two in a ways from the corners and the third centered.

You could do the two first and see how it works but I’d think it would be a bit thin in the center.