Temperature Control Recommendation?

Got a Smokemaster barrel smoker. Pics below, one of the smoker





Below is what I have been looking at..

Flame Boss
https://www.shop.flameboss.com/product/flame-boss-500-wifi-smoker-controller/

Bbqguru Pitbull Fan or Viper Fan:
https://www.bbqguru.com/storenav/gurucookerguide?DeviceModelId=74&kitId=405

The Perfect Draft BBQ fan
http://theperfectdraft.com/

Been also looking at DIY PID, but I'm not very smart at this kinda stuff. The options above, I would buy them no hesitation if they had adapters/manifold to go over my vent on my door. I would pay to have it custom built. Or, drill/cut hole for vent in my smoke, think I would want to do it in the back side of the firebox and install there, especially that big "The Perfect Draft BBQ" fan? How hard is that to do to drill/cut a hole? That is some thick steel my smoker. The Perfect Draft BBQ fan looks like the most robust fan, and got some pretty good reviews on youtubes...

Like that smoker.

Thx, I have had it since 1998, my son bought it for me for my birthday. He was only 1 year old when he bought it, so I had to pay for it of course, but it is the thought that counts. My wife got mad, but some things are out of my control.

My FIL pitt's and spitt's looks exactly like that, the only thing different is his shelf is made of expanded metal.