Will a garden wall be strong enough to mount a 90cm dish on?

Hi guys. Moved house to a place with loads of space, huge plot. I have a garden wall looking south built out of concrete blocks and render over the top. At least I think it is, it might be a just formed concrete. The wall is about 3 ft high. Don't want to drill into the house wall as its also concrete & I have no experience of drilling into concrete other than it seems to break up when I did try once! So trying the garden wall I don't mind. What type of wallplugs should I use?

I have...

Will a garden wall be strong enough to mount a 90cm dish on?