Using HereFlow optic sensor with a TFMini

Hello, I need to do a GPS-less drone to fly inside a greenhouse. To fly in loiter mode, Im using an optic sensor called HereFlow. However, as I have read in some posts, its better to pair it with another rangefinder as the integrated one is to short (2m) Im using for that a TFmini. How can i connect both so HereFlow uses the TFmini? Also, Im using another TFmini for front colision avoidance. Would I have enough ports in my Pixhawk 2.4.8?

And the last question. Which version of arducopter should I use?