Exporting stereo ch1=LT ch2=RT and Dolby 5.1 question

Hi, 

I have done some research, but the info I find is 7-10 years old or more, and Premiere has changed in that time, so I'm hoping someone can help me complete this workflow using best practices with Premiere 24.5

I have a deliverable to a local theater - they would like the audio in either

• Stereo Ch1=LT, Ch2=RT

or

• Dolby 5.1: Ch1=L, Ch2=R, Ch3=C, Ch4=Sub, Ch5-LS, Ch6=RS, Ch7=LT, Ch8=RT
• IMPORTANT: 5.1 Audio mix must include LT/RT on CH7 and CH8 (complete down mix)

I normally export for computer/web use, which is either stereo (or mono) on however many tracks necessary, so this type of audio work is new to me.

For Stereo Ch1=LT, Ch2=RT, I have created a sequence:

and then added audio:

If I choose to Export in Apple Prores 422 HQ, (what the company asked for),

1. Do I set my output to 2 channel, or to stereo? (see image below)
2.  Is there any way I can verify it has been exported correctly before I send it in and annoy their QC team with a file that isn't done right?
3. Is this how you make a Ch1=LT Ch2=RT stereo file, or is there a better way?

For the Dolby section...

• Dolby 5.1: Ch1=L, Ch2=R, Ch3=C, Ch4=Sub, Ch5-LS, Ch6=RS, Ch7=LT, Ch8=RT
• IMPORTANT: 5.1 Audio mix must include LT/RT on CH7 and CH8 (complete down mix)

I have seen there are a couple different ways to set this up, and I'd like advice on the best way to do it, that will meet the requirements above.  

I do not have any plug-ins or external rack mounted hardware, just Premiere.

I have a stereo sound file, which I duplicated then converted to mono.

I have created two additional mono files, panning the sound to the left and right in each.

What are my first steps, and how can I verify I've done things correctly before, again, irritating a QC engineer.

Many, many thanks -

Scott