The advice you're received about the latching mechanism is 100% correct.
I would, however, like to mention that a smart TV isn't necessarily the best option. The "smarts" built into it aren't always the best available, aren't upgradeable, etc.
On the other hand, a dumb flat screen with a Roku device or similar device will do everything a smart TV will do. Rokus are generally considered to be one of the best options. Most TVs sold today have some degree of "smarts" but you can always add a Roku device. Even a Roku TV has the same limitations in comparison with a TV and an external Roku device. I have one (a TCL) and fully expect that one day I'll need to upgrade or fix it with an external device.
I guess my point is, if you're happy with your current TV except for it being dumb, don't feel you need to replace it with a Smart TV, just buy a Roku device. Personally, I'd go with the "box" version and not the stick version. If you do go the smart TV route, I'd recommend a Roku TV. In fact, many tech sites recommend adding a Roku box to a non-Roku smart TV. Here's one example: