I'm not disagreeing with you, but the Bible does use place-location language when referring to God. Jonah 1:3 But Jonah rose up to flee unto Tarshish from the presence of the Lord (who dwelt in the temple)Zobel said:
I don't think we should understand the Father as having place-location. "Somewhere" implies "sometime" because for us place and time are fundamentally linked. Since we know God is not subject to time, He also cannot be subject to place as we understand it. It's a kind of figurative language. Heaven is not a physical place, it's not somewhere you can navigate to.
Even today, Rev. 7:15 Therefore are they before the throne of God, and serve him day and night in his temple
As mentioned above, Jesus did ascend "somewhere" and now sits at the right hand of God.
Obviously, as you said we are also to understand in reality God does not have a place-location.
Ps. 139:8 If I ascend up into heaven, thou art there: if I make my bed in hell, behold, thou art there.
I'm not even sure "omnipresent" is the best term since it's not apophatic.