Over concrete I would definitely install the required taped-joint waterproof underlayment (likely foam), even if the LVT has a built in underlayment.. Any low spots can be shimmed with underlayment scraps. Plastic beater blocks work but I prefer a good hardwood one like hickory or white oak. And depending on the lock system sometimes a hammer works better than a soft mallet. And don't cheap out an your Z bar. While LVT is good and trendy, lately I have been going with stranded bamboo (from Lowe's), extremely hard and you know you are working with wood. Make sure whatever you go with had a ceramic (aluminum oxide) finish. Ten years and not a scratch on my kitchen floor.
https://www.lowes.com/pd/Cali-Bamboo...-ft/1000000496