There are a total of 12 meditation statues in the game. They do not have to be found in the same playthrough. If you are missing some, you can choose 'Meditate' in the menu and it will show which statues you have unlocked as they are listed in order.
Maka91 has made a perfect guide for the game which shows you all of the collectibles and achievements. So if the video helps you, be sure to give Maka a thumbs up on YouTube. You can complete the whole game with the guide, but if you are only looking for the statues, I have listed the time stamps below.
Time stamps for the statues:
Chapter 1:
3:05 - Meditation Statue 1
8:30 - Meditation Statue 2
Chapter 2:
13:43 - Meditation Statue 3
19:12 - Meditation Statue 4
20:19 - Meditation Statue 5
Chapter 3:
23:14 - Meditation Statue 6
30:37 - Meditation Statue 7
32:29 - Meditation Statue 8
Chapter 4:
36:20 - Meditation Statue 9
41:35 - Meditation Statue 10
Chapter 6:
51:40 - Meditation Statue 11
59:00 - Meditation Statue 12