I am no expert in where it should go but it definitely doesn't belong randomly in the middle lane imo. I think in the future it should be moved to the left hand side near the tasks icon. Thats my opinion anyway.
On a different note, great job on fine tuning the mobile so far! I've absolutely been playing and following small changes throughout the run and I must say the level of seriousness you put into the product is awesome. Please just make sure to market it aggressively and well. I play from Japan so I have no idea how well RS mobile is being advertised in the UK/US. Obviously here it isn't advertised anywhere (even on facebook or twitter) so I can't tell.
(Also unrelated, mobile games are more MTX heavy than runescape so if you market it here you could probably reel in a lot of people).
Thoughts and opinions of a Japanese RuneScape enjoyer c: