For 搁浅 standalone, the original chords are as below. On the left is played using F family of chords, which is slightly not very "finger-friendly" to play with as there are alot of barred chords. On the rightis played using Capo 5: Play C, which is simpler to play with.
For 天空 standalone, the original chords are as below:
For the medley I did in the above video, I played 搁浅 in D key (by Capo 2: Play C) else 天空 will be too high to hit.