Some cams come with a bracket that would make it much easier for you to mount https://pyrodrone.com/collections/cameras-and-accessories/products/foxeer-razer-mini-fpv-camera-pal-ntsc-switchable

Also here's a vtx that has a tiny display. Many would rely on the flight controller to set them up, this one is easier to set up on its own

https://www.amazon.com/AKK-FX2-ultimate-Configuring-Betaflight-Transmitter/dp/B07DPG38RY/ref=sr_1_10