How to hang canvas on wall?

[TVR MAN]

How many PHers does it take to hang a canvas?

I bought couple of original canvas "artworks" on gumtree recently but I don't know what the best way to mount them to the wall is? Ideally I want them flush to the wall which is a solid wall.

I've googled but it seems most canvasses don't have an internal frame which limits the fittings that could be used at the top middle - see below.

Any advice on how to mount it or what fittings to use is most appreciated.