If you chant mantras on mala then you must remember not to cross Meru of the mala. But you rather start chanting in backward direction.

For example…First Mantra you start in clockwise direction as marked 1 in image. For second chant one should start anti-clockwise aka from where you finished your 1st chant.

You should never cross Meru of the Mantra. It is believed that all the energy gets generated during chant is stored on Meru point and crossing it considered inauspicious. Best mala to use for Mantra chanting is Shiv-Shakti bead mala. Soon it will be made available.

Hope below image highlights the chanting method. Sorry for hand drawing. In image 1st chant is marked in blue colour and second is in Green. The yellow threads part or Tip of Mala is Meru point.