Brokeloser
When I bought my PA it had a pair of those Ram Tubes on the mounting boards, just like in your photo
On the first trip one of them busted at the ball mount when I tried to adjust it. Never used them again.
Some guys like their kayaks to be as crowded as Neil Pearts drum kit
Personally I like as little as possible in the way.
I have my sonar mounted at the sail mast (easy for me to reach when needed) and one Scotty rail mount (#245) on each side rail.
I may experiment with some different rod holders, but I'm happy with the sonar up front out of the way, it's clean, easy to remove and not one hole drilled in the kayak.
Tony (Neil Peart) Full-rac's answer was still a good one!
It's all about what works best for you.