I'm building a short (3.5 ft) fence in my front yard. I have most of the posts sunk in dirt holes, but two of them will need to be mounted on a concrete slab.
The problem is that the slab has a slight slope to it and the post brackets I have will cause the posts to not be completely vertical.
These are the brackets I bought: http://www.homedepot.com/p/Simpson-Strong-Tie-12-Gauge-Black-Powder-Coated-E-Z-Base-FPBB44/100655350
Is there something I can put under this bracket/anchor to make it sit level?