Pagoda post base on sloped porcelin patio

[Graham1967]

I am installing a pagoda over a porcelin patio. Two posts will be postcreted in the lawn, and two will be mounted into the patio.

 

I was planning to use fence post bases for the two patio mounted posts (with 4 x bolts going into the tiles/sub base).... drilling into porcelin with diamond drill bits and using chemical resin for fixings.

 

The issue I have is that the patio has a fall. How do I get the posts plumb? 

 

I read a few articles that recommend using galvanised steel washers under the two bolts on one side to level out. Would this be the recommend method to get the base/posts vertical?

 

Post base screenshot attached

Edited October 3, 2023 by Graham1967