To find the best location for placing corner reflectors, backscattering of the target area is checked first. One way is using SNAP, downloading SLC or GRD files and then going through some steps(thermal noise removal, calibration,…) to get the Sigma0 image. What about EO browser? In addition to gamma0, is it possible to visualize the calibrated backscatter coefficient, Sigma0, in EO as well?
EO Browser does currently not have these visualizations configured, but you can easily get them using Sentinel Hub process API or Sentinel Hub OGC services, e.g. WMS, WCS, etc.
More info here: