Update: Today I went and tried to remove the footwell lights again. This time it worked and I was able to attach the two remaining blue LED arrays easily. The cool thing is that I can easily remove and replace them with any other LED lighting I might want in the future : )
I followed some instructions on teslamotorsclub.com which used LED arrays that can be directly attached to already existing wires underneath the driver and passenger seats. I ordered them from amazon for a couple of bucks and had them installed in minutes. The hardest part is bending yourself in half trying to attach them to the underside of the seats....
The arrays can be easily attached to a little black wire that is situated under each seat. I ordered a set of four white and blue arrays and just installed the blue ones:
After reading through the many forum entries on teslamotorsclub.com where most of the solutions are based on installing rather complicated (at least for me) LED strips by using already existing wires, I found a much easier solution which can be done in 5 minutes.
I ordered these LED strips on amazon. They are self powered using 4 AAA batteries and have a motion sensor built in that only activates in low light conditions.
They come with a magnetic strip that fits perfectly underneath the trunk cover. I placed them on the left and right sides right underneath the plastic supports that hold the trunk cover. It's a perfect fit.