Hi there,
1) Try to get a "Guan Yin" in a sitting position.
2) You can ask a temple to help you to chant
You can try 海印学佛会 no.5 Lorong 29 Geylang Sagaramudra Buddhist Institute
3) As long the "Guan Yin" is taller than you when placed on the table. That is you have to look up when you offer your prayer.
Regards.