Which ultrasonic sesnor(s) or sonar sensor(s) can be attached with ArduPilot APM 2.8 Flight Controller Board?

I am looking for sensors that can be attached with APM 2.8 so that the drone keeps a safe distance from the ground.

I found MB1260 XL-MaxSonar-EZL0. It has a good range as well. My professor told me to search for more as well. He also mentioned that t

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