Expected Range for RAK811 module with RAK7258 gateway

Hi,

RAK811 (Ver 2.0.3.4) module;
EU868, TTN 8 channel (DR0-5), Default DR: 5, ADR:off, pwr_level: 0(max), OTAA

What is the expected range for RAK811 module(e.g. Wisnode Lora) with RAK7258 indoor Gateway?

Open area ?
Dens city ?
Data rates from DR:0(SF12BW125) to DR:5(SF7BW125)

Sorry I am disapointed in my test !