I'm in the same boat, we leave next Friday morning. I went on the Labcorp website but it has an update as of yesterday:
11/19 update: Due to the surge in COVID-19 cases, kits are currently reserved for individuals experiencing symptoms or those who have been asked to get tested by a healthcare provider, public health department, or contact investigator
I tried twice to get through the questionnaire but even if you select that you work in a congregate setting but have a low risk, you can't get the test kit

I don't want to answer that I'm high risk if I'm not, but it seems like that is the only way to get a test kit from them at this time.
My backup plan is to go to the Maingate testing site before we leave the following week, but I'm of the mindset that we can be exposed at any time after we get the test so what good is it anyway? Thinking of just doing the suggested quarantine once we get home and watch for symptoms and if we feel the need, get tested at the local walk-in center.