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Looks good to me. I dont think you will have any issues at the ends of the tank since you have 3.
You will probably be fine, without a par meter it can be hard on the spacing. Here's a videos BRS did, it should help you some and explain the spacing a little as well.
https://www.bulkreefsupply.com/content/post/brstv-investigates-ecotech-marine-radion-xr15-blue
You could get an RMS rail. Then you can move them based on your needs.