As you can see on the multi threads going on, there are many ways to QT. I do not chemically treat my fish unless I see signs of an issue. I usually TTM with two ten gallon tanks and use GC or Prazi at the end of TTM 2 and 4 for flukes. At times I will also FW dip. I then usually observe in a 20L for at least 2-3 weeks to make sure they are eating well and showing no signs of any internal parasites. Internal bugs are pretty common with wrasses so be prepared to treat food with either Metro and Focus or GC and Focus. Also, I am pretty nitpicky when it comes to watching for any signs ich or velvet. Wrasses hide both well due to their thick slime coats.
Most importantly, since they they are jumpers, a mesh cover for tank is a must! When I get ready to transfer to new tank, I drain the water from the tank down to about 1/4 left. Its easier to catch the wrasse with less water in the tank and less likely for them to jump out.
While I have had some success with this, I recently lost a couple of fish due to unknown reasons so have been thinking about changing and or tweaking my process.
Whatever you do, don't rush, be observant to issues that may arise. There are great resources for meds and treatment in the fish treatment threads. Good luck!
You might have the best luck if you add them both at the same time.