GFCIs/RCDs (30mA) should always be installed nowadays regardless of local legislation and regardless of fridges. All following values are meant for 220-240V voltage.
Like said in the comments, if they trip, there is some fault in the cable network or in the appliances which should be corrected. If old heating appliances like ovens or tank heaters trip a 30mA RCD, they could be run without RCD, but it's better to change the heating element resp. to check the appliances for insulation values.
In that sense, RCDs are an automatic check of the electric installation, and as intended, they provide inexpensive protection for ca. 30$ (40A, 30mA, suitable for non-linear (pulsed) load like switch mode power supplies).
According to the insurance companies here in Europe, many electrically tripped fires would have been avoided if RCDs had been installed. Electrocution is more seldom caused by missing RCDs.
In a wooden house there might be a higher probability of animals like martens, rats, mice, insects etc. to settle near the warm cables and to destroy the cables' insulation resulting in a fire. And for outside outlets, high humidity/UV radiation/high temperature changes etc. make it far more likely for the electric insulation to fail.
Before installation, the insulation values (phases <-> yellow green protection earth PE, phases <-> N and N <-> PE if disconnected) should be checked (at least 20kOhm, measuring voltage 250V, all bulbs removed (some switches have tiny discharge bulbs inside which also must be temporarily disconnected), but wall switches switched on, surge protection, ground fault and arc protection devices also disconnected). A good, dry installation has 50MOhm or more.
After installation of a RCD, the function should not only be checked by pressing the test button, but it must also be tested in the protected circuits, f.e. by connecting a lamp with power >= 15W to the phase and PE of an outlet.
One of the most frequent faults in electric installations is the (re-) connection of Neutral N with PE in TN-C or TN-C-S networks downstream of a RCD.
In that case the RCD would trip very frequently, even if the appliances which are switched on have no insulation faults.