Installing ro drain in single basin sink?

[Gk02]

Ok what’s the best option for installing an ro drain for my sink?

1. Install the included saddle drain on the area I highlighted in yellow?
2. Cut and add another p-trap on the horizontal drain section?
3. Use saddle on the vent section above current horizontal section?
4. Another option?

thanks!

 

[Reach4]

4. Another option?

https://airgap.com/product/ag200-005/

 

[Sponsor]

 

[Gk02]

Interesting option and that would work but I think my wife is going to veto that on her new countertop. Any other thoughts? I can just order the watts part that plugs into the disposal and has a push connect for a 1/4” drain. Just thought maybe adding another ptrap might be better in the long run but don’t know if that would be ok to code.
Thanks