I’m intrigued by the Ikea Kalashnikov range 
…and there was me thinking Badger was your faithful protector.
The Kallax units are slightly less than 40cm deep - only just enough for an LP to sit in them.
The 8 compartment unit is ~147cm wide or high depending on which way up you have it and ~77cm wide/high.
So, if you have 170cm of width, an 8 unit would do it? Mine hold ~65/70 LPs in each segment, so adequate for ~400LPs.
Using an 8 would also give you a great deal of top shelf space. Of course, you can prop these units off the floor up for ease of use. 400 LPs, of course, are heavy.
Other benefits of Kallax are the various colours and that you can easily stick hardboard on the back to seal off against dust and spiders et al. Others on here have applied stops (in various forms) to the back edges, to prevent LPs getting pushed too far in.
A previous thread may assist: