Hi Randy,
There are a couple of shade devices - a Bimini made from frame and fabric, like Sunbrella, and then there are T-tops that can have a soft or hard top. 170s are pretty tippy by nature and T-tops are really not a good choice for the 170. I can steer my 170 just by stepping right or left of the console. Some people have added them but a good tall Bimini does a good job.
I have not seen a Bimini that was flat on top, all have been bowed to shed water. Best to talk to a couple local canvas companies for a quote.