These white, heavy duty wall-mount speaker brackets from Soundlab are extremely sturdy. They're angle-adjustable and can handle a maximum load of 30 kg.
They have a standard 35 mm Top Hat fitting. Now at a lower price due to over-ordering. When they're gone, they're gone!
One pair supplied. Screws/bolts are not supplied as this will depend upon the type of wall you are fitting them to.