I own Ashcor Technologies and we do IT and AV.
https://Www.ashcortechnologies.com
There are two ways to go about this, Either you get a full-blown outdoor TV that cost thousands of dollars or you get a super cheap one for about $400 dollar TV like you’re talking about.
As a rule, we avoid using wireless HDMI unless it’s in the same room as the transmitter. Honestly we’ve never really put one in unless wiring is impossible and the customer is told flat out that we can’t guarantee it will be reliable. wireless just isn’t reliable in any form. So if you can get wires to the location that’s the best bet.
what we usually wind up doing is placing the cable boxes, Roku, or other device in the house and simply running an HDMI cable out to the TV through a waterproof outside box.
if going the cheap TV route, we always get a cover to put on the TV and explain to the owners that you may get a season or two out of it if you take care of it, but a 55 inch outdoor TV is roughly $5000 so you can replace the cheap TV for several years even if you replace it every year for less money.
you’ll still need power to the TV so you’ll need electrician to put an outlet out there for you, unless you can do that yourself. You should never run power cords for devices in wall as this is against code and the jacketing isn’t rated for in wall.
mounting the TV you can use just about any mount there is out there. They do have special outdoor mounts but they’re honestly just better powder coating on them. As long as it’s somewhat sheltered it’ll be fine most likely.
One of the main differences between a regular indoor TV and an outdoor TV is the ability to see the TV in daylight. If you’re using a cheap TV you’ll only be able to watch it at night unless the area is very shaded. The other issue is if the TVs in direct sunlight it will most likely overheat and burn everything out especially during the hot summer. The high-end direct sunlight TVs have heavy duty built-in fans to keep the system cool in direct sunlight.
When going the cheap TV route I usually go with the TCL Roku TV that has Roku built into it so all you really need is power and good Wi-Fi