Cutting into wall to fit ceramic door number tiles

[massivetoe]

Hi,

Someone posted something similar a few years ago with no response. I bought some ceramic house number tiles (very similar to image attached). I need to attach the tiles to the wall of my house. The wall has roughcasting (aka harling or pebbledash). Should I cut a rectangle out of the harling, chip it with a bolster and fill the gap with tile adhesive? Or something else? I don't really want to botch it straight on to the pebbled surface.

I have a small angle grinder, I will maybe need to get a notched trowel and some other bits? Which adhesives/renders will be best suited?

Suggestions please! (And gratefully received)

MT

 

[foxhole]

Glue to small timber plaque and glue to wall, allows for removal without breakage.

 

[Alec_t]

BluTack or similar is surprisingly good for fixing things to rough or smooth surfaces. Use a big blob at each corner and centre of the tile.
I've used it for fixing bell-pushes securely (but removably) to brick.