I can recommend the Thinkpad Thunderbolt 3 dock. It's fully compatible with the MacBook Pro. With the latest firmare (or gen2 of the dock - there are two generations), it supports MBP with 2x4K@60Hz (on gen1, one of them needs to be driven from the second Thunderbolt/USB-C port). No DisplayLink needed.

You can get this on sale for reasonable prices. Here's a second hand dock currently going for $80: https://www.ebay.com/i/303430714025