I have bought and used several of these 5" monitors (see link), I have GoPro mounts so I can mount them almost anywhere/to anything, it is an "El Cheapo" drone monitor kit, but is just full of good stuff for the DIY'er, I bought 3 when they were on sale, and have enjoyed using them with both my drone gear and camera gear. This has proven "hands down" to be the least expensive way to a larger monitor, and/or portable monitor for multiple uses. For what they are the video/live view/playback quality is very good. I do use a small external battery/power block so I don't tax the cameras power system.
www.amainhobbies.com/ecopower-fpv-headset-goggles-ecp-2200/p483231 Two are velcro'ed to the back of a SONY DSLR LCD (bought two with bad LCD intending to repair the LCD), then I had the large view screen epiphany, and portable viewscreen linked to the cameras with 5.8GHZ R/C Transmitters/Receivers and Remote Control for camera functions (you can also do this with tablets/laptops/phones and apps) but I love building little setups that are just a little different.
www.amainhobbies.com/ecopower-fpv-headset-goggles-ecp-2200/p483231 The entire kit is $32.00, that's right $32.00 (gotta love the Chinese), and I bought a large GoPro type accessory kit for all the holders and attachment stuff, it was inexpensive off Ebay. Any additional cables and connectors are available cheap for customizing the set-up. They can also be mounted to hot shoe as another option.
I would also recommend looking at some of the newer VR headsets, and glasses with HUD (Heads Up Display) panels built in, another interesting potential, but a bit more costly. Higher quality "Back-up Camera Monitors" also work well (have a couple of those as well, 7" and 9", and I have a little Amazon 7" tablet that works really well for Live View/Camera Control, etc. So many ways to go, another form of tethering.
Do some research, determine how many options you want, and build a little kit. It is generally all "plug-n-play" so other than polarity and good connections, you don't need any electronic skill, you don't even have to solder if you don't want to (they make adapters for everything these days). If you are interested in any of this let me know and I'd be glad to share data and resources. There are other kits and off the shelf set-ups, many, many options. Oh, all the camera functions work fine through the larger screens, like the focus highlighting on the Sony cams. Good luck in your quest.
mike
I have bought and used several of these 5" mo... (