1. My impression based on your description is that you are using a MacBook Pro (13-inch, 2019, Four Thunderbolt 3 ports) model laptop -->
https://support.apple.com/kb/SP795?locale=en_US
Can you please confirm if my impression is correct?
Yes, this is correct.
2. Can you please provide the specific model number (or a direct web link to) of the Belkin docking station you are using?
Belkin Thunderbolt 3 Express Dock - F4U095
3. You mention you have three Dell monitors. Can you please provide the specific model numbers of each Dell monitor?
2 x Dell P2319H, and 1 x Dell P2314H.