Installer of Quartz sink
 

Has anyone had a quartz sink installed in High Def Laminate? If so, who would you recommend?

We had porcelain sinks (both bathrooms) with HD Laminate as the original installation in our house. After several years the seal between the sink and the countertop failed. This was not easy to see as it was just a hairline gap, but less than 1 cup of water leaked out of a waterpik, the composite "wood" swelled, and the entire countertop had to be replaced. We later found similar seal problems on the other 2 sinks. IMHO, if you still go forward with this project, try to get the composite wood sealed at the cutout and make sure a very high quality (25 year silicone) sealer is used for the joint between the sink and the countertop.
I have no recommendations for this work, as I did my own replacements.

I am not much help, but all three quartz kitchen sinks I have had were undermounted, so don't know how that would work. Love, love my quartz sink.

I do not think you can under hang a sink (any type) in a High Def laminate countertop, the MFD wood would be exposed to the water and bad things would happen very quickly.