Thank you, sorry to be pain,
So description mentions that the card has 1* low profile bracket
https://www.tbsiptv.com/tbs6514-dtmb-dvb-c-quad-tuner-pci-e-card
so that is 79.20mm, looking at OptiPlex9020 Series
https://i.dell.com/sites/doccontent/shared-content/data-sheets/en/Documents/optiplex-9020-micro-technical-spec-sheet.pdf
that card would fit:
All-in-One (AiO) - Should fit here, but no info on the slots available, but the PC will be huge probably
mini-tower (MT) has 1 full height PCIe x16, 1 full height PCIe x16 (wired x 4), 1 full height PCIe x1, 1 full height PCI (so this should fit "*3*" x full-height PCI-e cards, and "1" x FULL HEIGHT older PCI card, right?)
small form-factor (SFF) has 1 half height PCIe x16, 1 half height PCIe x16 (wired x 4) (so should be able to fit "*2*" of the PCI-e cards?)
ultra small form-factor (USFF) has 1 miniPCIe connector (so only the TBS7610 DVB-C TV Tuner PCIe Mini Card-Digital Cable TV on PC would fit?)
micro (M) - no PCI-e/PCI/miniPCIe connectors .....
And what does the PCIe x16 (wired x 4), PCIe x16, PCIe x1 mean?
So I am looking for the smallest PC that has low-profile | half height PCIe bracket, right?