Question about Hauck Open'n Stop Safety Gate

Good day I have to shoot an opening with 115cm (bottom/base) and 117cm (top), do I understand this correctly. With additional extensions 2x21cm it does not work (min. 116)? With additional extensions 1x21cm and 1x9cm, it does not work either (max. 111.5cm). Copied from description: Opening width with extensions: with extension: 9 cm = opening widths from 83 - 90.5 cm with extension of: 9 cm + 9 cm = opening widths of 92 - 99.50 cm with extension of: 21 cm = opening widths of 95 - 102.50 cm with extensions of: 21 cm + 21 cm = opening widths of 116 - 123.5 cm with extensions of: 9 cm + 21 cm = opening widths of 104 - 111.50 cm