hp probook x360 435 g8 & Inspiron 15 with 3 external monitors docking station

My docking station has 3 monitors attached for the hp probook x360 435 g8 and for the Inspiron 15 3525 (former is for work).

For the HP, it only sees one monitor.

For the Inspiron, it sees 2 monitors.

Docking station: https://www.amazon.com/dp/B09NQQ1G1N?psc=1&ref=ppx_yo2ov_dt_b_product_details 

What do I need to have all three monitors working for both laptops? The USBs on the docking station are working.