By following this video you will be able to do it y.
Fixing fence posts to concrete wall.
You can apply the solution by brushing it onto the post or dipping the post into a tub filled with the liquid.
Once plumb re tighten fixings and check for plumb once more.
When installing a fence on an existing concrete pad some fence installers prefer to.
Drill hole in the post and the wall the same size usually 6 5mm no need to countersink the head they will just pull in flush some about 120 140 should be fine posted 4 years ago.
How to install a fence mounted to concrete surface mount fence post with anchor bolts.
Alternatively if you did not want the bottoms of the posts covering your wall you could have collars on the posts which would then be bolted to the top of the wall.
Make the hole large enough to ensure you can get a good swing at all sides of the concrete pier.
If you have an existing concrete slab and you want to mount fence posts.
After making sure the brick is clean and free of debris string the line tightly along the line of the fence posts or stakes and mark the point where it intersects the brick wall.
Step 3 remove the old post.
But yes normally you would want to dig and post crete them in.
Set posts then.
Use a sledgehammer to break up the concrete around the old post.
Look for copper naphthenate solutions at home improvement and paint stores.
Core drill holes through concrete.