If this is the tower workstation you should have no issue finding something that will fit. I didn't see an SFF or DT listed for this model.
Easiest thing would be to open the panel and see if you have two slots available on the upper PCI-E slot, see what manner of power connector you have, and see if anything else is in the way inside. Measure with a tape to see maximum length you can use.
The length is the easy one. On a previous Dell tower case I had problems with the height of an ASUS GTX1050 TI and the height is more difficult to measure and I haven't been able to find the max height is the specs.
The height is 4.8 inches and the height is the concern with the Dell workstation not the length. There are three fan Gigabyte designs that are under 4.6inches, RTX 2060 1660 etc. I think one should do fine.