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TPS2491: necessity of external GATE pin clamp for High Gate Capacitance with Reverse Voltage Protection

Part Number: TPS2491
Other Parts Discussed in Thread: CSD18514Q5A, LM5069

Dear Specialists,

My customer is considering TPS2491 and has questions.

I would be grateful if you could advise.

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I am considering TPS2491 based on Reverse Voltage Protection Circuit(SNVA683).

Vin=12V and 24V

It uses two FET(Q1 and Q2) with back-to-back.

On the other hand, datasheet of P.18, 8.1.2.5 High Gate Capacitance Applications, 

If the total gate capacitance of FET exceeds 4000pF, external gate clamp diode is recommended. 

I'd like to use CSD18514Q5A, Ciss is 2060pF(typ) and 2680pF(max).

It uses two,total gate capacitance is 4120pF, external gate clamp diode is needed.

In this case, could you please advise what type of external circuit and constant is recommended.

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I appreciate your great help in advance.

Best regards,

Shinichi