Comment by zhan_eg

For now, by my research the best candidates are

- TP-Link Archer C7 (supported by both DD-WRT and OpenWRT, and recommended by the latter)

- Linksys WRT1200AC/1900AC (supported by both DD-WRT and OpenWRT)

- Ubiquiti UAP-AC-LITE/LR/PRO (OpenWRT, diffrent models depending how much speed/range do you need. No routing here, just access points.)

For any models discussed, please keep in mind that depending on the hardware version, the firmware support is different.