Its an easy solo tame. Just stand infront of it with an tanky dino, jump off and go stand behind the velonasaur and shoot it with tranq arrows. When its almost knocked down it will try to walk away, just continue shooting it with tranq arrows and you have yourself a new velonasaur :)
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You don’t need to trap this to tame, it’s a solo tame. If you run up to it, it will go into turret mode then you need to walk circles around it and keep hitting with tranq until it eventually tries to walk away *in turret mode so really slow walking*
Make a 2x2 cage with ramps and a door. Lure the velonasaur in with a flyer. If you stay close to him he won’t enter turret mode. Leveling melee raises his projectile hit points. Also level stamina to attack longer. A high level can shred everything I’ve come across. Can’t wait for an imprinted one for the speed bonus.