Not sure if you understand that Revelation is indeed all symbolic, yet you continue to look for a literal translation....
This is Jesus and the 144k waiting in heaven, during the 42 months of the 8th kingdom, which are happening on earth.
In Revelation 13, these 144k and Jesus were defeated symbolically, because God was not done redeeming mankind, after Jesus was declared the 7th World Kingdom.
The 7th Kingdom only lasted 3.5 days.
If Jesus and the 144k are not waiting in heavenly Mount Zion at this point, then the winepress of God's wrath will happen the Sunday after the 7th Trumpet sounds.
There will be no 42 months of Mystery Babylon. There will be no third woe. There will be no 8th world wide kingdom, this short 42 months of abomination of desolation. Jesus and the 144k will not be defeated, and there will be no image placed as found in Revelation 13.
The reason why we are not told why, when, or how the 144k left earth and are waiting on Mount Zion is because this is not an exact prophecy, but an alternate scenario where Revelation 16 through 19 will now take place on the earth.
The narrative given was the sounding of the 7th Trumpet. Then 3.5 days later the 144k are no longer on the earth but in heaven. They left on white horses, because in Revelation 19, they return on white horses.
Revelation 14 is two halves like Revelation 7. Including the same group of 144k.
In Revelation 7, the 144k are on earth sealed and redeemed, already removed from Adam's dead corruptible flesh, while the church is waiting in heaven, and accounted for in the last half of the 7th chapter.
The 144k are on earth with Jesus through the 7th Seal, the first 6 Trumpets, and then the 7 Thunders. This is the final harvest, and the 144k are on the earth during this harvest.
Now we see at the 7th Trumpet, Jesus should be the 7th and final earthly kingdom lasting the next 1000 years, while Satan is bound. But 3.5 days after the 7th Trumpet started to sound, the week is split in half, and the last 3.5 days are when the 2 witnesses lay dead in Jerusalem per Revelation 11.
So the last half of Revelation 14, only takes place at the end of the 7 days of the 7th Trumpet, and the 144k would not be waiting on heavenly Mount Zion, but still on earth and the Millennial Kingdom would start at the end of the 14th chapter, thus chapters 15 through 19 would not even happen. Revelation 15 would not be necessary, because Israel would not have to wait on the sea of glass, but would enjoy Jerusalem for the next 1,000 years, and Satan's 42 months would never happen as the 3rd woe.