SFP+ transceivers and direct attach cables QNAP lists for its NAS models. Sorted by how many NAS models each is listed for.

PartNAS modelsBuy
QNAP TRX-10GSFP-SR-MLX (MFM1T02A-SR)183Amazon eBay
Eoptolink EOLQ-8540G-02-MO111Search Amazon
Mellanox MMA1B00-B150D111Amazon eBay
QNAP CAB-DAC30M-SFP28106Amazon eBay
QNAP TRX-25GSFP28-SR106Amazon eBay
QNAP CAB-DAC15M-SFP28104Amazon eBay
Mellanox 25GbE SR SFP28 MMF Optical Transceiver90Search Amazon eBay
Avago AFBR-709SMZ78Amazon eBay
Avago AFCT-739ASMZ78Search Amazon eBay
Cisco SFP-10G-SR78Amazon eBay
Finisar FTLX1471D3BCL78Amazon eBay
Finisar FTLX8574D3BCL78Amazon eBay
HP HPE X132 10G SFP+ LC SR (J9150A)75Search Amazon eBay
QNAP CAB-DAC15M-SFPP67Amazon eBay
QNAP CAB-DAC30M-SFPP67Amazon eBay
QNAP CAB-DAC50M-SFPP67Amazon eBay
Intel E10GSFPSR (FTLX8571D3BCV-IT)66Amazon eBay
QNAP CAB-DAC15M-SFPP-DEC0261Amazon eBay
NETGEAR AXM761-10000S60Amazon eBay
QNAP CAB-DAC30M-SFPP-DEC0259Search Amazon eBay
QNAP CAB-DAC50M-SFPP-DEC0259Amazon eBay
QNAP CAB-DAC15M-SFPP-DEC0157Search Amazon
QNAP CAB-DAC30M-SFPP-DEC0155Amazon
QNAP CAB-DAC50M-SFPP-DEC0155Amazon
Intel XDACBL1M53Amazon eBay
Intel XDACBL3M53Search Amazon eBay
QNAP TRX-10GITSFPP-SR53Amazon eBay
QNAP TRX-10GSFPP-LR30Search Amazon
10GTek AXS13-192-1023Amazon eBay
Finisar FTLF1436P3BCL6Amazon eBay
Finisar FTLF8538P4BCL6Search Amazon eBay
Intel E10GSFPLR (FTLX1471D3BCV-I3)6Amazon eBay
Mellanox MMA1B00-C100D5Amazon eBay
QNAP TRX-25GITSFP28-SR2Search Amazon