Scripture is used to interpret the question asked.In the two portions of scripture below,twice John falls down at the feet of the angel to worship him and twice the angel tells John not to worship him but to worship God only.
Revelation 19:9-10 New International Version - UK
9 Then the angel said to me, ‘Write this: Blessed are those who are
invited to the wedding supper of the Lamb!’ And he added, ‘These are
the true words of God.’
10 At this I fell at his feet to worship him. But he said to me,
‘Don’t do that! I am a fellow servant with you and with your brothers
and sisters who hold to the testimony of Jesus. Worship God! For it is
the Spirit of prophecy who bears testimony to Jesus.’
Revelation 22:8-9 New International Version - UK
8 I, John, am the one who heard and saw these things. And when I had
heard and seen them, I fell down to worship at the feet of the angel
who had been showing them to me. 9 But he said to me, ‘Don’t do that!
I am a fellow servant with you and with your fellow prophets and with
all who keep the words of this scroll. Worship God!’
Revelation 7:11 New International Version - UK
11 All the angels were standing round the throne and round the elders
and the four living creatures. They fell down on their faces before
the throne and worshipped God,
In the verse in question (Rev 7:11),it is the angels who fall down to worship God and taking into account the wording in Revelation 19:9-10 and Revelation 22:8-9 it must be concluded that the elders also, along with the four living creatures, fall face down before the throne and worship God.It would be absurd to suggest that the elders and the living creatures do not fall down to worship God while the angels do.See Rev 4:9-11
I know if i was there before the throne of God, i would have fallen face down and worshiped God! Why?, because the angel of Rev 19:10 instructs me to do so.
10 At this I fell at his feet to worship him. But he said to me,
‘Don’t do that! I am a fellow servant with you and with your brothers and sisters who hold to the testimony of Jesus. Worship
God!