Trade Gronk for....?

So I currently have gronk and Ertz in a no PPR league. Was thinking about moving gronk for a WR1 or RB1, what do you think I can expect to get for him?

Gronk is a difficult player to trade. I wouldn’t move him for anything less than someone you’d take on the first if the draft were to be re-held today. He’s that much of a difference maker. The problem is, many owners would be hesitant to give up that much for him due to positional scarcity and injury risk. Valid concerns. You may be better served pairing Ertz with a lower end RB/WR and targeting a team who’s really hurting at TE and offer a 2 for 1 that upgrades your WR/RB.