FTP Test Aero Position

Hello,
I am fairly new to TrainerRoad, and am really enjoying experience so far. Thanks for all the hard work you all put in to producing a great product!

I consider myself a novice endurance athlete. I have done a few half marathons, olympic triathlons, and most recently completed my first full marathon. When things get back to normal, I would like to complete a Half Ironman. I have been pretty inconsistent, the past 5 years due to life and work events, but now I am looking to get serious and do some structured training. I started the Half Distance Base program in May, but aggravated a dormant injury and it has become too painful to run. I will be seeing my doctor soon and plan to take as much time off as necessary from running for it to completely heal.

In the meantime, I plan to start on the Sweet Spot Mid Volume. I will have to do another FTP test, which brings me to my question. I have found conflicting information about which position to do the test in (Aero or Upright). In the past tests I have done, I start in the aero position. As the intensity increases, I will take breaks and ride on the bullhorns for portions of the interval. Am I cheating my test by doing this? What is your recommendation for position during the test?

I personally try to stay on aero to at least FTP (during ramp).

Once I get pass that then i may last another minute or 2 on aero

But at the end, I am almost out of the aero position. Its possible to stay (i have done it) but it get hard by the last minute or 2,

Since your Half IM race efforts will be well below threshold, I think you can be a bit more lax about holding position during training at or above threshold, unlike someone who specializes in TTs under an hour.