Early 2000 X5 4.4 and ODBFusion. Do I connect underhood@ round port or under dash?

[IX5DOU]

Hello, let me introduce myself to the forum. I have recently bought a silver 2000 X5 4.4 and after researching topics this forum for a month, I have two questions. I recently bought ODBFusion for my iPhone. I know I need a plug-in WiFi or Bluetooth plug in scanner. First, due to my early X5 make, which plug do I attach to? Is it the one under my dash like most IDBII vehicles or is it the round plug in the engine bay? Do you have recommendations as to what I should buy to connect the X5 and my iPhone/OBDFusion. Thank you in advance. I am grateful for any response. It is an honor to be allowed in this forum.