Hanafi
The sources give no view for it here.
وضع اليدين على الركبتين في الركوع
هل يضع المصلي يديه على ركبتيه إذا ركع؟
Each school’s answer
In our wordsHanafi
Not stated in the sources
Maliki
Not stated in the sources
Shafi'i
Not stated in the sources
Hanbali
Not stated in the sources
The texts
مسألة: وإذا ركع وضع يديه على ركبتيه لقوله عليه السلام للذي علمه الصلاة (ثم اركع وضع يديك على ركبتيك وفرق بين أصابعك) . وما ذكره ابن مسعود منسوخ لقول سعد (إنا كنا نفعل ذلك فنهينا عنه).
«الإشراف», al-Qadi Abd al-Wahhab p. 243
From the schools’ own books
Maliki
The sources give no view for it here.
Shafi'i
The sources give no view for it here.
Hanbali
The sources give no view for it here.
What is «in our words» is our standard wording; the books’ texts stay as they are.