This might be a little hard to explain, but basically at my mom's house back in the day they remodeled and had custom cabinetry installed in the living room. In the corner, there's an opening for the TV. When this was done, the TV was a rear-projection 50" and it obviously just sat on the wood of the cabinet under the opening. Like I said it's a 45 degree corner cabinet so the back of this opening is triangular.

Years later, we wanted to upgrade it to a LCD, and determined that a 55" LCD would juuuust fit with small bezels - and it does - but typical TV "stands" have the TV lifted off of the floor surface by 3-6 inches, and I need the bottom of the TV to be no more than one inch off of its bottom surface in order for it to fit in the spot.

At that time, we built a super janky homemade stand for it that bolted up to the factory stand's mounting points to hold the TV up. This TV had a totally flat bottom so it basically rested on the bottom of the TV, and imagine a giant steel L-bracket sticking off the back of the TV. It worked alright because FOR THAT TV, I guess it was relatively back-heavy so it leaned into the bracket.

Now it's time to replace the TV again, and the new TV is not back-heavy. It's pretty balanced and if anything, it's a touch front-heavy. So I built another janky L-bracket-style mount, but I had to add a 70lb bag of sand onto it to keep the TV from tipping over forward. So I don't like that. I'd like something better. Furthermore it's an LG TV so it has a bump in the middle of the bottom, so no flat bottom surface to rest on.

I looked into these style stands: https://www.amazon.com/dp/B07MZ7M13M/, but they're all designed for the feet to stick out in front of the TV - and I want the surface of the TV to be flush with the front of the cabinet, not recessed. So I need something like these except with the legs only extending backward, and presumably with some kind of weighted base.

Does anything like this exist? I guess the IDEAL solution would be to install a multi-joint extendable mounting arm screwed into the wall studs all the way back into the corner, but I imagine such a long-throw 55" TV mounting arm would be very very expensive and also very difficult to perfectly nail the 1" vertical spacing gap I'm dealing with.

Here's an illustration: https://i.imgur.com/IdM3OPm.jpg

Imagine this is a cutaway image from the side. The TV is flush with the front of the cabinet, and the big purple arm would be the weighted mounting base thing I'm imagining.