For people Wanting a cheep router to run OpenWrt look on ebay for TP-Link C7 or WD-N750 The N750 is not AC tho. All my routers can run SQM on my internet and it is 220 down and 12 up.
I need to disconnect everything and go direct to the modem but I really think the C7 just can’t handle it. Running DD-WRT with a modern cable modem.