Our fixed slat bases I believe are the strongest in Australia.
We use glue, screws and countersunk joints, we have 13 thick sturdy cross slats with 22 support blocks, the slats are spaced sufficiently to allow for plenty of ventilation to pass through, unlike many companies bases with fewer slats and a solid sheet on top. The surface is upholstered in an extremely breathable fabric and finished on the edges in a sturdy neutral taupe colour suede cover that goes with all décor. Ideal for triple sheeting. No need for valance or bedspread.
Strong, durable and good support for the mattress. You will NEVER have a structural problem with this base.
Counter sinking the support block and placing directly above the castor is stronger, minimising “creaking” and preventing the T nut ever falling out in transport.
Choice of 50, 100 or 150mm castors or Glides. 9 each for Queen and Double.