What is a shield anchor bolts?
Yes I agree I would never spend more than a tenner on a bracket, it's more about securing it to the wall properly than the actual bracket
The mount I've just retired after 5 years was under a tenner from Amazon, delivered. There's a lot of cheap ones about now that work well. I've just ordered 3 different ones under a tenner each, 1 I've used previously, for various TVs for a 40 and 55 inch and an aging, very weighty, 32 inch. Best thing I can recommend is using some decent shield anchor bolts. I trust them more than the ones any mount supplies. 4 - 6 of them and nothing is moving.