What type of success have you had if you DIY built an NVR using one of those “motherboards” I’ve seen sold online for quite cheap?

I’ve taken off the cover of a few NVRs (e.g. Lorex from Costco), and they look to be just a motherboard inside a case.

I realize that there will be ZERO tech support from such vendors but I’m a nerdy guy. I may be able to figure it out (perhaps with help from some of you(!)).

I plan to use Tapo and Reolink cameras that offer some sort of ONVIF capability.

I am primarily concerned about the apps these boards use. A lot of them talk about XMeye. I’d like to access recordings and get notifications of alerts on my phone when I’m traveling. Will XMeye do that for me effectively?

And a 2nd concern is whether or not they have a good web interface. E.g. Can I access and configure each remotely without needing to be in front of the board/NVR? I worry that some functionality is lost if I use the web interface.

I don’t need any fancy AI or anything. Just the ability to record 24×7 and to receive alerts from the cameras such as the alerting event gets recorded as a clip. (I want both 24×7 and alert clip recording and notification of alerts).

My current system is Blue Iris but I’m finding it isn’t 100% reliable. It may be the PC I’m using or it maybe Windows. I’d like to give an NVR a try after having used another one at another location. It was a no-name system but was rock solid. That no-name one never crashed and I like that.