I believe God hears us in whatever posture we are in.
I believe the first to kneel in the Bible was Daniel.
He prayed on his knees three times a day as was his custom.
Dan 6:10 Now when Daniel knew that the writing was signed, he went into his house; and his windows being open in his chamber toward Jerusalem, he kneeled upon his knees three times a day, and prayed, and gave thanks before his God, as he did aforetime.
Hezekiah faced a wall:
Isa 38:2 Then Hezekiah turned his face toward the wall, and prayed unto the LORD,
Hannah stood beside Eli and prayed:
1Sa 1:26 And she said, Oh my lord,
as thy soul liveth, my lord, I
am the woman that stood by thee here, praying unto the LORD.
I don't know what posture Jonah was in when he prayed from inside the fish's belly:
Jon 2:1 Then Jonah prayed unto the LORD his God out of the fish's belly,
Hugs