They're available all over the place. Amazon, Made.com Ebay Ikea also sell a few different ones. What are you looking for specifically? If you're not having a lot of luck, maybe it's the search term, as you put that you want a floating tv stand...................try looking for floating wall unit.

This is one I found that is 800mm. The one I saw this morning was different, but can’t remember what it was. I do prefer the white ceramic look but I haven’t found an inset ceramic sink drainer in the narrower width. Another thought was to have an inset ceramic sink of say 500 wide and then get one of those drainers with the tray and lip to use when washing up but leave you with usable worktop for folding clothes otherwise. https://www.tapwarehouse.com/product/clearwater-db5b

Something like this? https://www.clickbasin.co.uk/padova-glass-wall-mounted-washbasin-with-stainless-mount-and-tap-761.html

Hi folks, just a quick update, I moved the cabinet to the right side to see how it would look. it does has some added benefits of hiding all the wires and "filling in a void" in the corner ... symmetry is obviously gone - in the world of design rules, is that Ok? Hoping a tall plant on the left side can balance it out?The alternative would be to buy more black cabinets and put them on the left side to achieve the symmetry? Thanks for your the input so far, I think I'm going to go for the shelves setup arranged similar to pic 2 in the attached, but in walnut rather than grey, hoping that will look good. will veneer wood be OK? Should I do both sides or just the right side? And then maybe as minnie101 suggested, I will just put a plant on the left side to balance it out. I will also get a yellow chair and black lamp. As @Patrina suggested, I will definitely go for the grey patterned Roman blinds. PS. the left lamp is placed on top of the speaker temporarily as I got no where to put it....