I'm not sure of rules and regs for heel height but I have heard of some lifters going to the cobblers and having height added to the heel.
I do this. I prefer a boot and they tend not to have as high a heel as the shoes in the link. Sheep's clothing is quite correct that many PLers use flat shoes, but it alters the dynamics of the lift a lot. Generally it is harder to hit depth in a flat shoe than in a heeled one and a heel tends to keep the back more vertical that with a flat shoe. Best to try both and see for yourself which you prefer, personally I can't hit depth in a flat shoe so it's always a heel for me.
As far as I know, forgiveness is for the benefit of the person doing the forgiving, not the one being forgiven