Newbie's impossible dream: "Central Command" cabin with Head Unit and Blind Spot Camera/dash cams

Hi Folks. So I can't wait to upgrade the stereo with this head unit:
https://www.crutchfield.com/p_130AV1550/Pioneer-AVH-1550NEX.html
And some speakers. So the h/u will have a touchscreen and I as going to purchase a backup camera for it.

But what if I also want to have blindspot cameras that switch on when I signal to change lanes. I believe the need their own monitor. And what if I also want a dashcam and rear cam recording. I won't need input from them while driving, although a wide angle rear cam view came might be helpful. So I was thinking

SZDALOS 4CH Blind Spot Rear View Mirror/ 9.88 Full Touch Screen Electronic Rearview Mirror /Steering Triggered Blind Zone Observation / 4 Camera Lens simultaneous Recording / with Two 32G SD Card

this rearview mirror pulled all those together, but I could not find similar installs here. There are also some that have 2.5K or 4K but I could not find one that has blind spot mirror capability.

Does anyone have a combo setup like this? If these mirrors and cameras are too unreliable based on experience here, I might just go low tech and get this wide angle

$18 ICBEAMER 10.6" Car Rear View Mirror, HD Clear Tint, Panoramic Wide Angle Convex Surface, 2 Interior Retractable Rubber Clips, Anti Glare, Automotive Accessories Universal for Truck, Car, SUV, 1 Pack

mirror. But that still would leave me with a wish to get a dashcam and rearview camera for accident protection. What then have others with head units used. Don't think I could get the Pioneer h/u involved in those functions.

 

Sorry I can't help, but if you get this installed. I'd love to see the result.